Musty Linen Robe disappeared

On my son’s (Jupiteh) account, his Musty Linen Robe disappeared and isn’t showing up in the character selections screen as either available, locked, or unlockable.

Did anything change with it?

Does he still have a wizard hero selected? Only wizards can wear robes, so it doesn’t show up when you have switched to a warrior or ranger–could that be it?